About a week ago I bought three albums from the iTunes store (first time ever). Today is the first time I have tried to use iTunes since, and all my music is gone, except those three albums.
What has happened? What did I do wrong? I'm using the same laptop I've had since I bought it five years ago-MacBook OS X 10.9, iTunes version 12.4. As far as I know I haven't updated anything?
I am really not good with computers at all, so I'm hoping someone please can help me.

Not, but no one else seems to be giving it a shot.
It sounds like your purchases are going to a different media library than the one you keep most of your music in.
To fix, you want to get those new tracks into your regular iTunes library, and set that library as the default lib iTunes opens when it starts:

Open iTunes Preferences.
Click the 'Advanced' tab.
Look at and write down "iTunes Media folder location"
It should be something like: /Volumes/Io/Music/iTunes/iTunes Media

Open that folder in the Finder and check to see whether all your music is in it, or just the new stuff.
If it's the later, find out where you music is stored, and use the "Change..." button in that advanced tab to select the place where all your music lives.
Restart iTunes and you should be good to go.

If you want to keep the albums you just bought, drag copies of them to the desktop before you change the Media folder location. Then, after you change media folder loc, just drag the tracks back over the iTunes window, and the App will re-import them. -Once that's done, you can trash the copies on the desktop.

You may run into authorization on those tracks, but maybe not, since it's the Mac that's authorized.

Not, but no one else seems to be giving it a shot.
It sounds like your purchases are going to a different media library than the one you keep most of your music in.
To fix, you want to get those new tracks into your regular iTunes library, and set that library as the default lib iTunes opens when it starts:

Open iTunes Preferences.
Click the 'Advanced' tab.
Look at and write down "iTunes Media folder location"
It should be something like: /Volumes/Io/Music/iTunes/iTunes Media

Open that folder in the Finder and check to see whether all your music is in it, or just the new stuff.
If it's the later, find out where you music is stored, and use the "Change..." button in that advanced tab to select the place where all your music lives.
Restart iTunes and you should be good to go.

If you want to keep the albums you just bought, drag copies of them to the desktop before you change the Media folder location. Then, after you change media folder loc, just drag the tracks back over the iTunes window, and the App will re-import them. -Once that's done, you can trash the copies on the desktop.

You may run into authorization on those tracks, but maybe not, since it's the Mac that's authorized.

Not, but no one else seems to be giving it a shot.
It sounds like your purchases are going to a different media library than the one you keep most of your music in.
To fix, you want to get those new tracks into your regular iTunes library, and set that library as the default lib iTunes opens when it starts:

Open iTunes Preferences.
Click the 'Advanced' tab.
Look at and write down "iTunes Media folder location"
It should be something like: /Volumes/Io/Music/iTunes/iTunes Media

Open that folder in the Finder and check to see whether all your music is in it, or just the new stuff.
If it's the later, find out where you music is stored, and use the "Change..." button in that advanced tab to select the place where all your music lives.
Restart iTunes and you should be good to go.

If you want to keep the albums you just bought, drag copies of them to the desktop before you change the Media folder location. Then, after you change media folder loc, just drag the tracks back over the iTunes window, and the App will re-import them. -Once that's done, you can trash the copies on the desktop.

You may run into authorization on those tracks, but maybe not, since it's the Mac that's authorized.

Click to expand...

Me again. I looked in that folder in finder, and all my music is there? But iTunes is only showing the albums I bought. I also just updated iTunes, but it made no difference.

I'm thinking about getting a new app, any recommendations? Nothing fancy, I just want to be able to listen to music, make playlists etc. Just the basics. Don't mind paying for it if it's good.

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